Punching-machine



(No Model.) I

E. vB. STIMPSON. PUNHING MACHINE.

N0. 549,694. Patented NOV. 12, 18945.

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I UNITED STATES PATENT OFFICE.

EDWIN B, srIMPsON, OF BROOKLYN, NEW YORK.

PUNCHlNG-NIACHINE.

SPECIFICATION forming part of LettersPatent No.Y 549,694, dated November12, 1895.

Application iiled March 16, 1894.

To all whom t may concern:

Be it known that I, EDWIN B. STIMPsON, a citizen of the United States,residing at Brooklyn, in the county of Kings and State of New York, haveinvented certain new and useful Improvements in Punching Machines, ofwhich the following is a specification.

My invention relates most particularly to that class ofpunching-machines employed for ornamenting shoe-tips wherein a gang ofpunches, sometimes of different sizes and forms, are set in apunch-plate in a manner to form an ornamentally-perforated border on thetip. In this class of machines it is desirable that the punch-plate anddie-plate shall be readily removable from the machine in order that theymay be substituted by others. It is also desirable that the under sideor lower face of the punch-plate shall be free from holes, slots, orrecesses in order that it may be utilized to the best advantage forsetting punches therein in patterns. Keeping in view these requirements,the object of my invention is to provide means for securing thepunch-plate and die-plate firmly and Y quickly in place and in such amanner as to be readily removed for substitution by others. At the sametime the device for securing the punch-plate to the plunger-head is soconstructed that it does not interfere, with the setting of punches insaid plate at any point desired and to form any desired pattern.

In carrying out the invention the fastening or securing devices are soarranged as to prevent them from being lost or mislaid.

In the accompanying drawings I have illustrated an embodiment of myinvention. Figure 1 is afront View of a part of a punchingmachinefurnished with my improvements. Some of the parts are represented asbroken away or in section, as will be hereinafter explained. Fig. 2 is aplan of the plunger-head, showing the locking-levers.' Fig. 3 is adetached perspective view of one of the studs in the punch-plate. Fig.4: is a sectional view, and Fig. 5 a plan view, of the plunger-head andpunch-plate, illustrating a form of the fastening differing slightlyfrom that shown in Figs. 1 and 2. Fig. 6 is a view of the fastening forthe die-plate as seen from the under side of the machine-bed. Fig. 7

Serial No. 503,840. (No model.)

illustrates a slight modification of the fastening illustrated in Fig.l.

Before describing the construction illustrated I may say that I have notdeemed it necessary to show the entire punching-machine, as thesemachines are well known and they vary considerably in generalconstruction and form.

The punching-machine to which my improvements, as herein illustrated,are intended to be applied comprises a suitable bed A, on which ismounted a head, (not shown,) and in this head is mounted a reciprocatingplunger B, bearing a plunger-head C. Mechanism of any kind may beprovided for depressing and retracting the plunger.

`Usually a cam and lever device is employed for this purpose. On theplunger-head is removably secured a punch-plate D, provided with aseries of punches CZ, and on the bed is removably secured a die-plate E,provided with dies lor holes which register with the respective punches.The die-plate is provided, ordinarily, with a stripper F, having holesin which the punches play.

All of the 'above features are, broadly considered, old and well known.My invention, which will now be described, relates to the means forsecuring the punch-plate D and dieplate E removably to the plunger-headand base, respectively.

Referring first to Figs 1, 2, and 3, the punch-plate has secured in itand projecting from its upper face or back two locking-studs G,preferably situated near' its respective ends, and the plunger-head hasin it two holes c, which are so spaced as to register with these studs.In Fig. 1 the punch-plate and plunger are broken away at the right handso as to show the stud at that end in place. In one side of the stud Gat the point where it emerges from the-hole in the plunger-head isformed a transverse slot g. (Seen best in Fig. 3.)

On the upper face of the plunger-head are pivotally mounted two likelocking-levers H. Each lever is pivoted at fr and is provided with a camh, which is so placed as to engage the slot g in the locking-stud whenthe lever is in the position indicated in full lines in Figs. l and 2.The upper face of the cam g is beveled or inclined, as clearly seen inFig. l,

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so that when the lever is drawn in such a manner as to put the cam h inengagement with the recess g in the locking-stud its beveled surfacewill take under the shoulder formed at the upper edge of said recess anddraw the punch-plate D up firmly to the plun ger-head. By throwing thelevers II back to the position indicated by dotted lines at the right inFig. 2 the punch-plate may be removed by withdrawing the locking studsfrom the holes in the plunger-head.

By cutting a recess, as g, in the stud G a shoulder is formed for thecam to engage without any lateral projection on the stud which wouldprevent it from passing up through the hole in the plunger-head; but inFig. 7 I have shown another way of providing such a shoulder. In thisview the stud G is represented as provided with a laterallyproj ectin gpin gx, which forms the shoulder, and the hole c in the plunger-head hasa groove cx, like a keyway, to permit said pin to pass when the stud Gis inserted.

Figs. 5 and l illustrate another construction, wherein a head g isformed on the stud G to provide the necessary shoulder. In this case anopen slot cL extends from the hole c (see Fig. 5) to the edge of theplunger-head to permit the stud G to be inserted by a lateralmovcment.This view, Fig. 5, also shows the cam h made inthe form of a fork, so asto take under the head g of the stud at both sides. In all the severalvarieties of the construction the studs G are secured firmly in theplate, as they need not be removed, and the locking-lever is attached tothe plunger-head, so that it will not be lost or displaced.

The die-plate Il is secured removably to the base A in a manner somewhatsimilar to that described. The construction of the fasten ing isillustrated in Figs. l and G. In Fig. l the bed and a part of thedie-plate are represented in section to show the parts in place.

In the die-plate E are two holes e, preferably near the respective endsof the plate, and in these holes are locking-studs I. The shank of thestud I lits snugly but loosely in the hole in the die-plate, and saidstud has a head 'i at each end so that it cannot escape from the hole e.In the bed A, and properly registering with the studs in the die-plate,are holes a of such size as to allow the heads yi on the lower ends ofthe studs to pass. Pivotally mounted at y/ on the under side of the bedare locking-levers IIA", substantially like the levers II beforedescribed, and provided each with a beveled cam hx to engage theshoulder formed by the lower head a on the bolt I and draw the die-platedown firmly to the bed. Ordinarily the punch-plate and dieplate areconnected when placed in the machine, the punches l being pushed downinto the dies or holes in the die-plate. Thile thus connected, they arepassed under the uplifted plunger-head, the studs G passed up throughthe holes e in the head C, and the locking then eifected with the leversIl. The studs I are then dropped through the holes in the bed and theplunger depressed, so as to seat the die-plate on the bed while thepunches are in their holes. Then the die-plate is seated, the lookin gis elected by the levers I-Ix.

The above mode is a convenient way of setting the die-plate andpunch-plate in place; but they may be put in place as preferred by theoperator.

So far as the means for securing the dicplate on the bed is concerned,this may be employed in connection either with the de* vice for securingthe punch-plate shown in Figs. 1 and 2 or with that shown in Figs. 4 and5. This latter is the form of fastening device for the punch-plate whichl believe to be new.

Having thus described my invention, l claiml. In a punching machine, thecombination of a plunger-head having parallel open-ended slots, apunclbplate having shouldered lugs adapted to enter said slots andlocking-levers mounted on the plunger-head in position to engage theshoulders on said lugs, whereby the attachment and removal of saidpunchplate are greatly facilitated, substantially as set fort-h.

2. In a punching machine, the combination with thc apertured bed andapertured dieplatc, of the loose, double-headed lockingstuds in thedie-plate, and the locking-levers mounted on the bed and adapted toengage the shoulders formed by the lower heads on the respectivelocking-studs, substantially as set forth.

The combination in a punching mach ine of the apertured bed A, theslotted plungerhead C, the locking-levers IIx, mounted on said bed, andthe locking-levers II, mounted on said plunger-head7 of the punch-platel), provided with shouldered studs lr, adapted to enter the .respectiveslots in the plungerhead, and the loose, double-headed studs I, mountedin the die-plate and adapted to pass down through the apertures in thebase and be engaged by the locking-levers I'l, substan-' tially as setforth.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

EDWIN B. STIIHPSON. lVitnesses I'IENRY CoNNE'rT, 'PETER A. Ross.

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